- NIAGARA FALLS POSTCARD HISTORY.
- A Woodward size D exciter governor on the left and a Woodward LHR 2500flb type gate shaft type governor on the right
- Niagara Falls area factory history.
- Niagara Falls area factory history.
- An application of a Woodward compensating type water wheel governor.
- An application of a Woodward compensating type water wheel governor.
- A Woodward UG25 governor system.
- Greenock water wheel governor drawing, circa 1847.
- Greenock water wheel governor drawing, circa 1847.
- A Woodward-UG25 governor on a diesel engine.
- Greenock water wheel governor drawing, circa 1847.
- Greenock water wheel governor drawing, circa 1847.
- Niagara Falls in Aviation Week, circa 1965.
- Niagara Falls factory district map.
- ALLIS-CHALMERS COMPANY HISTORY.